Electric clock.



No. 692,509. Patented Feb. 4, I902.

M. FISCHER.

ELECTRIC CLOCK.

' (Applicatipn filed Sept. 3', 1901.)

(No Moda'L) filiwrwes:

UNITED STATES PATENT OFFICE.

MARTIN FISCHER, OF ZURICH, SWITZERLAND, ASSIGNOR TO AGTIENGESELL- SOHAFT MAGNETA, (ELEOTRISCHE UHREN OHNE BATTERIE & OI-INE CONTACTE,) OF ZURICH, SWITZERLAND, A FIRM.

ELECTRIC CLOCK.

SPECIFICATION formingpart of Letters Patent No. 692,509, dated February 4, 1902 Application filed September 3, 1901. Serial No. 74,162. (No model.)

To aZZ whom it may COW/067% is moved by weight or spring power act in Be it known that I, MARTIN FISCHER, a citisuch a way that the armature is forced each zen of the Republic ofSwitzerland, residing at time to make a half revolution; but the Zurich, Switzerland, have invented new and greater portion of this revolution is valueless,

useful Improvements in Electric Clocks, of sincethere is an effective current impulse 55 which the following is a specification. only when the polarity of the armature is sud- This invention relates toacurrent-producdenly reversed, while the remainder of the ing magneto-electric clock with an armature movement represents lost energy. In such caused to oscillate by means of the goingmaster-clocks the armature is stopped sud- I0 train, and according thereto the armature or denly at each half-revolution, thereby caus- 6o armatures is or are stopped in its or their ing a hard noisy blow and a rebound of the armovements after each change of polarity, and mature and transmit ting shocks to the mechthe momentum of the armature acts against anism. These disadvantages (shocks and the oscillation-angles on one or-more springs wasted energy) are obviated by means of the for the purpose, on the one hand, of obviatmechanism hereinbefore described, since the 65 ing shocks to the mechanism and, on the armature does not make a half-revolution, other hand, of utilizing the inertia of the arbut only a slight to-and-fro movement, and

mature. T the movement of the armature is stopped by An example of a clock according to this inmeans of springs. 2o vention is shown in the accompanying draw- Having now particularly described and as- 70 ings. certained the nature of my said invention and Figure 1 is an elevation, and Fig. 2 aplan. in what manner the same is to be performed, 5 denotes a releasing-lever which is oper- I declare that what I claim is- 4 ated at certain intervals-for example, every 1. The combination with a current-generminute-in a known manner by the goingator, its armature, an abutment rigidly con- 75 train of an ordinary clock, and thus causes nected to the latter and a spring on either side the crank 6, which is driven by a spring or and in-the path of said abutment; of means by weights through a train of' wheels, to ro- 7 foroscillating the armature, for the purpose tate each time through a halfrevolution. set forth. I

The crank is connected, by means of the link 2. The combination with a current-gener- 8o 7, to one arm of an armature, so that each ator, its armature, an abutment rigidly contime the crank 6 is operated the armature is nected thereto and aspring on either side and suddenly moved to and fro., On the armain the path of said abutment; of mechanism tureshaft there is mounted an arm 3, which for oscillating'the armature and means for '35 at each oscillation of the armature acts timing the operation of said mechanism to pe- 85 against the oscillatory movement by means riodically impart to the armature a partial roof a pin 4, which compresses one or the other tation first in one direction and then in anof the two springs 8. other, for the purpose set forth.

By stopping the armature in its movements 3. The combination with a current-gener- 40 by means of the springs shocks which might ator, its armature, an abutment rigidly con- 0 damage the mechanism are avoided, while, on nected thereto, a spring on either side and in the other hand, by compressing the springs the path of said abutment, and a revoluble the inertia of the armature is stored and is crank connected with the armature to impart utilized when the lever 5 is again released to to it a partial rotation first in one direction start the oscillation of the armature. By this a and then in another at each revolution of said 95 means the energy of the weights or springs, crank; of mechanism for rotating the crank which acts on the crank 6 and serves for movand means for timing the operation of said ing the armature, can be reduced to a minimechanism, for the purposes'set forth. mum and very light armatures can be used. I. The combination with a current-gener- Previous master-clocks in which an armature ator, its armature, an abutment rigidly con- I00 nected thereto, aspring on either side and in the path of said abutment, a revoluble crank connected to the armature to impart to it a partial rotation first in one direction and then in another at each revolution of the crank; of mechanism for revolving said crank, a clock time-train and appliances controlled thereby and timing the operation of said mechanism, for the purpose set forth.

5. The combination with a current-generator, its armature, an abutment rigidly secured thereto, a spring on either side and in the path of said abutment, a revoluble crank connected to the armature to impart to it a partial rotation first in one direction and then in another at each revolution of said crank, 

